The migration pattern of 20 eagles over one year (J. Stewart, “Incredible Map Shows Flight Routes of Eagles Over theCourse of One Year,” March 6, 2019, Last access: Feburary 27, 2021). Based on this pattern, a scientist hypothesizes that eagles circle around Caspian sea. |
To verify the hypothesis, the scientist needs to purchase data-roaming services from only 6 out of the 10 countries around Caspian sea. All hexagons who have the same color are within the same country. |